Broadcom Fabric OS up to 10.0.0 Federated Authentication issuer input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.0$0-$5k0.00

Summaryinfo

A vulnerability classified as very critical has been found in Broadcom Fabric OS up to 10.0.0. This affects an unknown function of the component Federated Authentication. This manipulation of the argument issuer causes input validation. This vulnerability is registered as CVE-2026-87678. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in Broadcom Fabric OS up to 10.0.0. Affected by this vulnerability is some unknown processing of the component Federated Authentication. The manipulation of the argument issuer with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An input validation and output encoding vulnerability exists in the web management interface of Brocade Fabric OS versions before 10.0.1. When configuring Federated Authentication (FA), the system fails to sanitize the Identity Provider (IdP) issuer parameter. An authenticated administrator—or an attacker capable of supplying crafted FA configuration files during an import routine—can inject arbitrary web server directives. This can lead to service denial by preventing the web management daemon from starting, or potentially alter web server security controls.

The advisory is shared at support.broadcom.com. This vulnerability is known as CVE-2026-87678 since 09/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2026).

Upgrading to version 10.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-94672) and CERT Bund (WID-SEC-2026-3817). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Broadcom Fabric OS

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.0

VulDB Base Score: 8.4
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Fabric OS 10.0.1

Timelineinfo

09/09/2026 CVE reserved
10/08/2026 +29 days Advisory disclosed
10/08/2026 +0 days VulDB entry created
10/09/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: support.broadcom.com
Status: Confirmed

CVE: CVE-2026-87678 (🔒)
GCVE (CVE): GCVE-0-2026-87678
GCVE (VulDB): GCVE-100-415225
EUVD: 🔒
CERT Bund: WID-SEC-2026-3817 - Broadcom Fabric OS: Mehrere Schwachstellen

Entryinfo

Created: 10/08/2026 05:06
Updated: 10/09/2026 03:59
Changes: 10/08/2026 05:06 (67), 10/08/2026 06:44 (1), 10/09/2026 03:59 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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